package lx.jdbc;

import java.sql.*;
import java.util.Scanner;

public class AppLogin {
    public static void main(String[] args) throws Exception {
        System.out.println("请输入账号： ");
        Scanner scanner = new Scanner(System.in);
        String username = scanner.nextLine();
        System.out.println("请输入密码： ");
        String password = scanner.nextLine();
        loginPlus(username,password);
    }
    public static void login(String n, String p) throws Exception {
        System.out.println("username=" + n);
        System.out.println("password=" + p);
        String sql = "SELECT id FROM `user` WHERE username = '"
                + n +
                "' AND `password` = '"
                + p +
                "'";
        System.out.println("组成的SQL语句是：" + sql);
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
        String username = "root";
        String password = "1102";
        Connection connection = DriverManager.getConnection(url,username,password);
        Statement statement = connection.createStatement();
        ResultSet set = statement.executeQuery(sql);
        if (set.next()){
            System.out.println("登陆成功");
        }else {
            System.out.println("登陆失败");
        }
    }
    public static void loginPlus(String n, String p) throws Exception {
        System.out.println("输入的账号："+n);
        System.out.println("输入的密码："+p);
        String sql ="SELECT id FROM `user` WHERE username=? AND `password`= ?";
        Class.forName("com.mysql.jdbc.Driver");
        String url="jdbc:mysql://localhost:3306/test?useSSL=false";
        String username="root";
        String password="1102";
        Connection connection = DriverManager.getConnection(url, username, password);
        PreparedStatement ps = connection.prepareStatement(sql);
        ps.setString(1,n);
        ps.setString(2,p);
        ResultSet set = ps.executeQuery();

        if(set.next()){
            System.out.println("登录成功");
        }
        else{
            System.out.println("登录失败");
        }


    }
}
